On Friday, 26 August 2016 21:21:01 BST you wrote: I'm moving some Kmail Maildir folders from a Fedora machine to a > Debian Jessie machine using the KmailCVT import tool. All the time > I get an error message which says.... > > Error: Could not add message to folder new. Reason: Unknown > collection for '658' Apologies for the duplicate messages. I wasn't getting anything back at this end. -- Richard